package com.seig.canteensystem.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.seig.canteensystem.common.BaseContext;
import com.seig.canteensystem.common.CustomException;
import com.seig.canteensystem.entity.*;
import com.seig.canteensystem.mapper.OrderMapper;
import com.seig.canteensystem.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShopingCartService shopingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     *
     * @param orders
     */
    @Transactional
    public void submit(Orders orders) {
        //获取当前用户id
        Long currentId = BaseContext.getCurrentId();


        //获取当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId, currentId);
        List<ShoppingCart> shoppingCarts = shopingCartService.list(lambdaQueryWrapper);

        if (shoppingCarts == null || shoppingCarts.size() == 0) {
            throw new CustomException("购物车为空，不能下单哦~");
        }

        //查询用户数据
        User user = userService.getById(currentId);


        //查询用户地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);

        if (addressBook == null) {
            throw new CustomException("地址信息为空，请填写地址！");
        }

        long orderId = IdWorker.getId();//订单号

        AtomicInteger amount = new AtomicInteger();

        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        orders.setNumber(String.valueOf(orderId));
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));
        orders.setUserId(orderId);
        orders.setId(orderId);
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getCityName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + addressBook.getDistrictName() == null ? "" : addressBook.getDetail()
                + addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName());

        this.save(orders);

        //向订单表插入数据（一条数据）
        this.save(orders);


        //向明细表插入数据（多条数据）
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shopingCartService.remove(lambdaQueryWrapper);
    }
}
